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Exam Code: <strong>GB0</strong><strong>280</strong><br />
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Exam Name: Constructing Enterpriselevel<br />
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Question: 1.<br />
Which of the following are the right description to the backbone area?<br />
A. The backbone area ID is 0.0.0.0.<br />
B. All other areas must connect to the backbone area.<br />
C. Between the backbone areas it can be disconnected.<br />
D. Each ABR (Area Border Router) should be connected to at least one backbone area.<br />
Answer: ABD<br />
Question: 2.<br />
Which of the following are the right description to the adjacency between routers in the OSPF<br />
protocol?<br />
A. Two routers, if they are in bidirectional adjacency, that is, they receive the Hello message from each<br />
other, they automatically become adjacent.<br />
B. If two routers are adjacent, the underlying network between them is probably Point-to-Point.<br />
C. If two routers are adjacent, the underlying network between them is probably Point-to-MultiPoint.<br />
D. If two routers are adjacent, the underlying network between them is probably Broadcast. One of<br />
them must be a DR or BDR.<br />
E. Only when the two routers are adjacent will they exchange the LSA message.<br />
Answer: BCDE<br />
Question: 3.<br />
Two routers running the OSPF protocol are synchronizing the Link State Database. When you check<br />
the peer state machine on one of them, it indicates it has reached the FULL state. Therefore, such a<br />
conclusion can be drawn that if you check the peer state machine from the other router, it should also<br />
indicate that it has reached the FULL state.<br />
A. True<br />
B. False<br />
Answer: B<br />
Question: 4.<br />
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To view the information of the DR and BDR in the OSPF area, you can use<br />
A. Display ospf<br />
B. Display ospf error<br />
C. Display ospf interface<br />
D. Display ospf peer<br />
Answer: A<br />
Question: 5.<br />
Which is wrong about the BGP protocol?<br />
A. BGP is a robust routing protocol.<br />
B. BGP is to check the route loop.<br />
C. BGP can not summary routes of the same type.<br />
D. BGP inherits from EGP<br />
Answer: C<br />
Question: 6.<br />
Which of the following is the way to avoid loop in the BGP protocol?<br />
A. Record the source of the route in the attribute: origin<br />
B. Record the AS route in the attribute: AS-Path<br />
C. Record the next hop in the Next-Hop attribute<br />
D. Affect the choice of egress for another AS in the MED attribute<br />
Answer: B<br />
Question: 7.<br />
In the BGP protocol, the function of the community attribute NO-EXPORT is to<br />
A. Indicate that the route with this attribute should not be notified to any peer out of the alliance<br />
B. Indicate that the route with this attribute, once received, should not be notified to any BGP peer.<br />
C. Indicate that the route with this attribute, once received, should not be notified to any EBGP peer.<br />
D. None of the above<br />
Answer: A<br />
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Question: 8.<br />
BGP community is a group of destinations with public attributes. <strong>For</strong> a network or an AS there can be<br />
only one community.<br />
A. True<br />
B. False<br />
Answer: B<br />
Question: 9.<br />
RTA notifies RTB about a learned route 1.1.1.0/24 from the EBGP peer. RTA and RTB are in the same<br />
AS.<br />
The attributes of the route are listed as the following:<br />
local preference:100<br />
MED: 100<br />
AS_PATH: 200<br />
Origine: EGP<br />
Next_hop: 88.8.8.1/16<br />
The attributes of the received route by RTB will be<br />
A. Local preference: null, MED: 100, AS_PATH: 200 100 ,Origine :EGP, next_hop: 10.110.20.1/16<br />
B. Local preference:100, MED: 100, AS_PATH: 200 ,Origine: EGP, next_hop: 88.8.8.1/16<br />
C. Local preference:100, MED: null, AS_PATH: EGP, Origine :EGP, next_hop: 10.110.10.1/16<br />
D. Local preference: null, MED: 0, AS_PATH: 100 200, Origine: EGP, next_hop: 88.8.8.1/16<br />
Answer: B<br />
Question: 10.<br />
Bi-directional Import refers to that routes are imported mutually between routing protocols. To<br />
prevent route loop, you can<br />
A. prohibit route redistributing from 2 different routing processes which runs over the same router<br />
into each other.<br />
B. Use filter-policy import<br />
C. Use filter-policy export<br />
D. Use fire-wall<br />
Answer: ABC<br />
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Question: 11.<br />
The route will be matched with each if-match clause under the node of the route-policy in order.<br />
Passing one if-match clause means passing the whole route-policy.<br />
A. True<br />
B. False<br />
Answer: B<br />
Question: 12.<br />
How many attributes can every RADIUS packet carry?<br />
A. 1<br />
B. 2<br />
C. 3<br />
D. Multiple<br />
Answer: D<br />
Question: 13<br />
In which ways can VPN benefit the ISP (Internet Service Provider) and VPN user?<br />
A. ISP can build a long-term cooperation with enterprises and extend the service, taking advantage of<br />
the existent network resource.<br />
B. It is cost-saving for VPN users.<br />
C. The VPN user can transfer the WAN maintenance task to the profession ISP.<br />
D. The enterprise can allocate network address to the VPN user in a unified way.<br />
E. The private data transmitted through the pubic network is guaranteed with security.<br />
Answer: ABCDE<br />
Question: 14.<br />
Which of the following are right about ESP?<br />
A. ESP encapsulates the data to an IP packet after encryption to ensure its privacy.<br />
B. The user can choose the encrypted Hash algorithm to ensure integrity and authenticity of the<br />
packet.<br />
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C. In conjunction with anti-replay window and packet authentication, the AH protocol adopts 32 bits<br />
sequence number to prevent and defend replay attacks.<br />
D. Under transmission mode, the AH protocol encrypts the effective data in the IP packet.<br />
E. Under the tunnel mode, the AH protocol encrypts the entire IP packet.<br />
Answer: ABCDE<br />
Question: 15<br />
In what ways that the Integrated Service varies from <strong>Best</strong>-Effort services?<br />
A. First Come, First Served.<br />
B. Guaranteed Service<br />
C. Controlled-Load Service<br />
D. Service similar to ISDN<br />
Answer: BC<br />
Question: 16.<br />
Why average length of the queue is adopted to check the length of the queue in WRED?<br />
A. Because the queue length can not be calculated directly.<br />
B. Average Queue can balance the resource seizure.<br />
C. Comparing the queue length (the absolute length of the queue) with the thresholds before dropping<br />
the packet will lead to unfairness to the burst traffic, which is disadvantageous to traffic<br />
transportation.<br />
D. The average length of the queue is related with the types of the supported services.<br />
Answer: C<br />
Question: 17.<br />
Which are the right one/ones about OSPF among the following descriptions?<br />
A. If some changes take place on the network topology, OSPF immediately dispatches an update<br />
packet, and synchronizes these changes to the Autonomous System.<br />
B. Comparing with RIP, it can save bandwidth.<br />
C. It supports the dispatch of protocol packets with multicast addresses.<br />
D. The measure ranges 0 through 255.<br />
E. It supports equivalent value routes to the same destination address.<br />
F. Its algorithm prevents self-loop routes.<br />
G. It supports Variable Length Subnet Mask (VLSM)<br />
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Answer: ABCEFG<br />
Question: 18.<br />
The packets of OSPF are encapsulated in the IP. The protocol number used is<br />
A. 23<br />
B. 89<br />
C. 520<br />
D. 170<br />
Answer: B<br />
Question: 19.<br />
The right description to the OSPF protocol are<br />
A. It is a link state-based protocol running in the AS and developed by IETF.<br />
B. According to the collected link state information, OSPF calculates the shortest path to get the route.<br />
C. It allows the AS network to be partitioned into areas. The route information transmitted between<br />
areas is further abstracted to reduce seizure of bandwidth.<br />
D. It transmits the packet according to the multicast address at the multicast-enabled data link layer,<br />
which greatly reduces the interference to the other network equipment.<br />
Answer: ABCD<br />
Question: 20.<br />
In which ways does OSPF describe the network topology?<br />
A. There is only one router on which the port is connected to the network segment.<br />
B. The port connects to a router through point-to-point network.<br />
C. The port connects to multiple routers through broadcast or NBMA network.<br />
D. The port connects to multiple routers through point-to-multipoint network.<br />
Answer: ABCD<br />
Question: 21.<br />
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The right procedure for the OSPF protocol to calculate the route is<br />
A. Every router produces a LSA according to the topology around it.<br />
B. Calculated on the collected LSAs to span a shortest path tree.<br />
C. Send the LSA to the other routers in the network, and meanwhile collect the LSA produced by other<br />
routers.<br />
D. Produce the Link-State Database.<br />
A. A-B-C-D<br />
B. A-C-B-D<br />
C. A-C-D-B<br />
D. D-A-C-B<br />
Answer: C<br />
Question: 22.<br />
In the network running the OSPF protocol£¨only a single area£©, which are right description to LSA<br />
and LSDB among the following?<br />
A. Every router gets the same LSDB (Link-State Database).<br />
B. Every router does not get the same LSDB (Link-State Database).<br />
C. The routing table for each router is different.<br />
D. Each router gets the same routing table.<br />
Answer: AC<br />
Question: 23.<br />
The Hello message in the OSPF protocol is<br />
A. To discover and maintain peers.<br />
B. To describe the local LSDB.<br />
C. To request LSA that does not exist locally to the opposite end, or the opposite end automatically<br />
updates LSA.<br />
D. To elect DR and BDR<br />
E. To have the LSA at the opposite end updated<br />
F. To be dispatched periodically between two OSPF peers, and to monitor the link state.<br />
Answer: ADF<br />
Question: 24.<br />
In the OSPF protocol, the Database Description (DD) packet is<br />
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A. To discover and maintain peers.<br />
B. To describe the local LSDB.<br />
C. To request LSA that does not exist locally to the opposite end, or the opposite end automatically<br />
updates LSA.<br />
D. To elect DR and BDR<br />
E. To have the LSA at the opposite end updated<br />
F. To make the acknowledgement after receiving LSU<br />
Answer: B<br />
Question: 25.<br />
In the OSPF protocol, the LSR packet is to<br />
A. To discover and maintain peers.<br />
B. To describe the local LSDB.<br />
C. To request LSA that does not exist locally to the opposite end, or the opposite end automatically<br />
updates LSA.<br />
D. To elect DR and BDR<br />
E. To have the LSA at the opposite end updated<br />
F. To make the acknowledgement after receiving LSU<br />
Answer: C<br />
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